ADD file via upload

Dao.java

@@ -0,0 +1,34 @@
+package com.dao;
+import java.sql.*;
+import javax.sql.DataSource;
+import javax.naming.*;
+public interface Dao {
+    public static DataSource getDataSource(){
+	   DataSource dataSource = null;
+	   try {
+	      Context context = new InitialContext();
+	      dataSource = 
+            (DataSource)context.lookup("java:comp/env/jdbc/webstoreDS");
+	      System.out.println("这里到了吗");
+	  }catch(NamingException ne){
+	     System.out.println("异常:"+ne);
+	     System.out.println("查找数据源不成功");
+	  }
+	  return dataSource;
+	}
+    public default Connection getConnection() throws SQLException {
+    	System.out.println("这里");
+	   DataSource dataSource = getDataSource();
+	   System.out.println("那这");
+	   Connection conn = null;
+	   try{
+		   System.out.println("连接");
+		   conn =  dataSource.getConnection(); //
+		   System.out.println("连接成功");
+	   }catch(SQLException sqle){
+		   System.out.println("异常:"+sqle);  
+		   System.out.println("链接失败");
+	   }
+	   return  conn;
+   }	
+}